Abstract

Corrosion protection of mild steel in simulated refinery wastewater solution (2 wt% MgCl₂) by sodium sulfite, as oxygen scavenger inhibitor type, was studied at different temperatures, inhibitor concentrations, rotational velocities and exposure times using weight loss and electrochemical techniques. Oxygen concentrations were also monitored at initial and final conditions. The corrosion inhibition process was optimized by 2⁴ full factorial experimental designs. Optimum conditions of minimum corrosion rate were 40 °C, 40 ppm, 1250 rpm, and 6 h for temperature, inhibitor concentration, rotational velocity, and exposure time. Oxygen levels were reduced by the addition of the scavenger. The amount of oxygen reacted and removed during the corrosion process was evaluated and mathematical relationships were obtained. Electrochemical measurements showed that the corrosion potential shifted to the more active direction and corrosion current decreased with the addition of scavenger. Surface morphology investigations proved that the addition of SS prevents the steel surface damages.

中文翻译：

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亚硫酸钠作为氧气清除剂，用于炼油厂废水中低碳钢的腐蚀控制：优化，数学建模，表面形态和反应动力学研究

摘要

使用失重和电化学技术研究了在不同温度，抑制剂浓度，旋转速度和暴露时间下，作为氧气清除抑制剂类型的亚硫酸钠对模拟炼油废水溶液（2 wt％MgCl ₂）中低碳钢的腐蚀防护。在初始和最终条件下也监测氧气浓度。腐蚀抑制过程通过2 ⁴优化完整的析因实验设计。最低腐蚀速率的最佳条件是温度，抑制剂浓度，转速和暴露时间为40°C，40 ppm，1250 rpm和6 h。通过添加清除剂降低了氧气含量。评估了腐蚀过程中反应和除去的氧气量，并获得了数学关系。电化学测量表明，随着清除剂的加入，腐蚀电位向更活跃的方向移动，腐蚀电流减小。表面形态研究证明，添加SS可以防止钢表面损坏。